(19)
(11) EP 0 354 517 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
18.09.1991 Bulletin 1991/38

(43) Date of publication A2:
14.02.1990 Bulletin 1990/07

(21) Application number: 89114569.0

(22) Date of filing: 07.08.1989
(51) International Patent Classification (IPC)5: H04S 3/02
(84) Designated Contracting States:
DE FR GB IT

(30) Priority: 12.08.1988 JP 202225/88

(71) Applicant: SANYO ELECTRIC CO., LTD.
Moriguchi-shi, Osaka (JP)

(72) Inventor:
  • Ishikawa, Tsutomu
    Ota-shi Gunma-ken (JP)

(74) Representative: Glawe, Delfs, Moll & Partner 
Patentanwälte Postfach 26 01 62
80058 München
80058 München (DE)


(56) References cited: : 
   
       


    (54) Center mode control circuit


    (57) A center mode control circuit comprises an amplifying portion (31) for amplifying a center input signal, a switch (34) connected to an input terminal of the amplifying portion, capacitors (35, 36) selected by the switch and having different characteristic from each other. The switched are a normal mode for adding low frequency component of the center input signal to left and right input signals, a phantom mode for adding full range of the center input signal to the left and the right stereo input signals, and a wide mode for not adding the center input signal to the left and the right stereo input signals.







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